Table 4.

Sign test results represented in p-value. The sign test rejects the null hypothesis (the former is not less than the latter) when the p-value is less than the significance level. In the 10% significance level, the cases of not rejecting the null hypothesis are underlined.

Failure Defined at	a:IE b: Absolute Energy		a:IE b: Count
	ch1	ch2	ch1	ch2
Initiation	$1.0\times {10}^{-1}$	$3.3\times {10}^{-2}$	$1.0\times {10}^{-1}$	$6.6\times {10}^{-2}$
250 μm	$7.7\times {10}^{-3}$	$7.7\times {10}^{-3}$	$6.0\times {10}^{-2}$	$6.0\times {10}^{-2}$
500 μm	$1.3\times {10}^{-3}$	$1.3\times {10}^{-3}$	$1.6\times {10}^{-2}$	$7.7\times {10}^{-3}$
1000 μm	$4.5\times {10}^{-5}$	$1.5\times {10}^{-4}$	$3.3\times {10}^{-2}$	$6.0\times {10}^{-2}$
Transition	$1.2\times {10}^{-5}$	$1.5\times {10}^{-4}$	$3.3\times {10}^{-2}$	$6.0\times {10}^{-2}$
Fracture	$4.4\times {10}^{-1}$	$2.4\times {10}^{-1}$	$6.0\times {10}^{-2}$	$1.6\times {10}^{-1}$